我使用 Bazel 作為我的構建系統，并且在我開始嘗試使用 Boost Log 之前，Boost 沒有任何問題，我什至能夠毫無問題地使用一些已編譯的庫，但是當嘗試使用 Boost.Log 或嘗試構建時瑣碎日志記錄的示例我得到了許多未定義的參考錯誤。
我嘗試使用以下 bazel 構建命令進行構建：
bazel build //app:boost-log-test
bazel build --cxxopt="-pthread" //app:boost-log-test
bazel build --cxxopt="-lpthread" //app:boost-log-test
bazel build --cxxopt="-DBOOST_LOG_DYN_LINK" --cxxopt="-lpthread" //app:boost-log-test
bazel build --cxxopt="-lboost_log" --cxxopt="-lpthread" //app:boost-log-test
bazel build --cxxopt="-DBOOST_LOG_DYN_LINK" --cxxopt="-lboost_log" //app:boost-log-test
bazel build --cxxopt="-DBOOST_LOG_DYN_LINK" --cxxopt="-lboost_log" --cxxopt="-lpthread" //app:boost-log-test
bazel build --cxxopt="-DBOOST_LOG_DYN_LINK" --cxxopt="-lboost_log" --cxxopt="-lpthread" --cxxopt="-std=c 17" //app:boost-log-test
并且所有這些都導致了我在這篇文章底部包含的相同錯誤。我的 Boost 根位于/opt/boost/boost_1_77_0以下是我的專案結構。
./WORKSPACE：
new_local_repository(
name = "boost",
path = "/opt/boost/boost_1_77_0",
build_file = "external/boost.BUILD",
)
./external/boost.BUILD：
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "boost-headers",
hdrs = glob(["include/boost/**"]),
visibility = ["//visibility:public"],
includes = ['include'],
)
cc_library(
name = "boost-allbuilt",
srcs = glob(["lib/*.a"]),
visibility = ["//visibility:public"],
)
...
cc_library(
name = "boost-log",
srcs = ["lib/libboost_log.a"],
visibility = ["//visibility:public"],
)
cc_library(
name = "boost-log_setup",
srcs = ["lib/libboost_log_setup.a"],
visibility = ["//visibility:public"],
)
...
cc_library(
name = "boost-wserialization",
srcs = ["lib/libboost_wserialization.a"],
visibility = ["//visibility:public"],
)
./app/BUILD：
load("@rules_cc//cc:defs.bzl", "cc_binary")
cc_binary(
name = "boost-log-test",
srcs = ["log_test.cpp"],
deps = [
"@boost//:boost-headers",
"@boost//:boost-log_setup",
"@boost//:boost-log",
],
)
./app/log_test.cpp（的精確副本/opt/boost/boost_1_77_0/libs/log/example/trivial/main.cpp）：
/*
* Copyright Andrey Semashev 2007 - 2015.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file main.cpp
* \author Andrey Semashev
* \date 07.11.2009
*
* \brief An example of trivial logging.
*/
// #define BOOST_ALL_DYN_LINK 1
// #define BOOST_LOG_DYN_LINK 1
#include <boost/log/trivial.hpp>
#include <boost/log/core.hpp>
#include <boost/log/expressions.hpp>
int main(int argc, char* argv[])
{
// Trivial logging: all log records are written into a file
BOOST_LOG_TRIVIAL(trace) << "A trace severity message";
BOOST_LOG_TRIVIAL(debug) << "A debug severity message";
BOOST_LOG_TRIVIAL(info) << "An informational severity message";
BOOST_LOG_TRIVIAL(warning) << "A warning severity message";
BOOST_LOG_TRIVIAL(error) << "An error severity message";
BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";
// Filtering can also be applied
using namespace boost::log;
core::get()->set_filter
(
trivial::severity >= trivial::info
);
// Now the first two lines will not pass the filter
BOOST_LOG_TRIVIAL(trace) << "A trace severity message";
BOOST_LOG_TRIVIAL(debug) << "A debug severity message";
BOOST_LOG_TRIVIAL(info) << "An informational severity message";
BOOST_LOG_TRIVIAL(warning) << "A warning severity message";
BOOST_LOG_TRIVIAL(error) << "An error severity message";
BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";
return 0;
}
構建輸出：
[user@computer cpp]$ bazel build --cxxopt="-DBOOST_LOG_DYN_LINK" --cxxopt="-lboost_log" --cxxopt="-lpthread" --cxxopt="-std=c 17" //app:boost-log-test
INFO: Analyzed target //app:boost-log-test (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
ERROR: /home/blueder/Projects/MarketProphet/cpp/app/BUILD:11:10: Linking app/boost-log-test failed: (Exit 1): gcc failed: error executing command /usr/bin/gcc @bazel-out/k8-fastbuild/bin/app/boost-log-test-2.params
Use --sandbox_debug to see verbose messages from the sandbox
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function main: error: undefined reference to 'boost::log::v2_mt_posix::trivial::logger::get()'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function main: error: undefined reference to 'boost::log::v2_mt_posix::trivial::logger::get()'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function main: error: undefined reference to 'boost::log::v2_mt_posix::trivial::logger::get()'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function main: error: undefined reference to 'boost::log::v2_mt_posix::trivial::logger::get()'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function main: error: undefined reference to 'boost::log::v2_mt_posix::core::get()'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function main: error: undefined reference to 'boost::log::v2_mt_posix::core::set_filter(boost::log::v2_mt_posix::filter const&)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::aux::light_rw_mutex::lock_shared(): error: undefined reference to 'pthread_rwlock_rdlock'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::aux::light_rw_mutex::unlock_shared(): error: undefined reference to 'pthread_rwlock_unlock'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::attribute_name::attribute_name(char const*): error: undefined reference to 'boost::log::v2_mt_posix::attribute_name::get_id_from_string(char const*)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::record::reset(): error: undefined reference to 'boost::log::v2_mt_posix::record_view::public_data::destroy(boost::log::v2_mt_posix::record_view::public_data const*)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::record boost::log::v2_mt_posix::sources::basic_composite_logger<char, boost::log::v2_mt_posix::sources::severity_logger_mt<boost::log::v2_mt_posix::trivial::severity_level>, boost::log::v2_mt_posix::sources::multi_thread_model<boost::log::v2_mt_posix::aux::light_rw_mutex>, boost::log::v2_mt_posix::sources::features<boost::log::v2_mt_posix::sources::severity<boost::log::v2_mt_posix::trivial::severity_level> > >::open_record<boost::parameter::aux::tagged_argument_list_of_1<boost::parameter::aux::tagged_argument<boost::log::v2_mt_posix::keywords::tag::severity, boost::log::v2_mt_posix::trivial::severity_level const> > >(boost::parameter::aux::tagged_argument_list_of_1<boost::parameter::aux::tagged_argument<boost::log::v2_mt_posix::keywords::tag::severity, boost::log::v2_mt_posix::trivial::severity_level const> > const&): error: undefined reference to 'boost::log::v2_mt_posix::core::get_logging_enabled() const'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::aux::record_pump<boost::log::v2_mt_posix::sources::severity_logger_mt<boost::log::v2_mt_posix::trivial::severity_level> >::record_pump(boost::log::v2_mt_posix::sources::severity_logger_mt<boost::log::v2_mt_posix::trivial::severity_level>&, boost::log::v2_mt_posix::record&): error: undefined reference to 'boost::log::v2_mt_posix::aux::stream_provider<char>::allocate_compound(boost::log::v2_mt_posix::record&)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::aux::record_pump<boost::log::v2_mt_posix::sources::severity_logger_mt<boost::log::v2_mt_posix::trivial::severity_level> >::auto_release::~auto_release(): error: undefined reference to 'boost::log::v2_mt_posix::aux::stream_provider<char>::release_compound(boost::log::v2_mt_posix::aux::stream_provider<char>::stream_compound*)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::sources::aux::severity_level<boost::log::v2_mt_posix::trivial::severity_level>::set_value(boost::log::v2_mt_posix::trivial::severity_level): error: undefined reference to 'boost::log::v2_mt_posix::sources::aux::get_severity_level()'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::record boost::log::v2_mt_posix::sources::basic_logger<char, boost::log::v2_mt_posix::sources::severity_logger_mt<boost::log::v2_mt_posix::trivial::severity_level>, boost::log::v2_mt_posix::sources::multi_thread_model<boost::log::v2_mt_posix::aux::light_rw_mutex> >::open_record_unlocked<boost::parameter::aux::tagged_argument_list_of_1<boost::parameter::aux::tagged_argument<boost::log::v2_mt_posix::keywords::tag::severity, boost::log::v2_mt_posix::trivial::severity_level const> > >(boost::parameter::aux::tagged_argument_list_of_1<boost::parameter::aux::tagged_argument<boost::log::v2_mt_posix::keywords::tag::severity, boost::log::v2_mt_posix::trivial::severity_level const> > const&): error: undefined reference to 'boost::log::v2_mt_posix::core::open_record(boost::log::v2_mt_posix::attribute_set const&)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::sources::basic_logger<char, boost::log::v2_mt_posix::sources::severity_logger_mt<boost::log::v2_mt_posix::trivial::severity_level>, boost::log::v2_mt_posix::sources::multi_thread_model<boost::log::v2_mt_posix::aux::light_rw_mutex> >::push_record_unlocked(boost::log::v2_mt_posix::record&&): error: undefined reference to 'boost::log::v2_mt_posix::core::push_record_move(boost::log::v2_mt_posix::record&)'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::value_extractor<boost::log::v2_mt_posix::trivial::severity_level, boost::log::v2_mt_posix::fallback_to_none, boost::log::v2_mt_posix::trivial::tag::severity>::operator()(boost::log::v2_mt_posix::attribute_name const&, boost::log::v2_mt_posix::attribute_value_set const&) const: error: undefined reference to 'boost::log::v2_mt_posix::attribute_value_set::find(boost::log::v2_mt_posix::attribute_name) const'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::value_extractor<boost::log::v2_mt_posix::trivial::severity_level, boost::log::v2_mt_posix::fallback_to_none, boost::log::v2_mt_posix::trivial::tag::severity>::operator()(boost::log::v2_mt_posix::attribute_name const&, boost::log::v2_mt_posix::attribute_value_set const&) const: error: undefined reference to 'boost::log::v2_mt_posix::attribute_value_set::end() const'
bazel-out/k8-fastbuild/bin/app/_objs/boost-log-test/log_test.pic.o:log_test.cpp:function boost::log::v2_mt_posix::value_extractor<boost::log::v2_mt_posix::trivial::severity_level, boost::log::v2_mt_posix::fallback_to_none, boost::log::v2_mt_posix::trivial::tag::severity>::operator()(boost::log::v2_mt_posix::attribute_name const&, boost::log::v2_mt_posix::attribute_value_set const&) const: error: undefined reference to 'boost::log::v2_mt_posix::aux::attach_attribute_name_info(boost::exception&, boost::log::v2_mt_posix::attribute_name const&)'
collect2: error: ld returned 1 exit status
Target //app:boost-log-test failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 0.175s, Critical Path: 0.04s
INFO: 2 processes: 2 internal.
FAILED: Build did NOT complete successfully
uj5u.com熱心網友回復：
--cxxopt選項被傳遞給編譯步驟而不是鏈接步驟，所以任何形式的--cxxopt=-lsomelib. 用于--linkopts在命令列上配置鏈接標志，或添加，例如，linkopts = ['-pthread']cc 目標。- 您可能希望節省一些精力并使用Boost 的現有 Bazel 規則集。
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